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package gerenciadordesenhas;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class DesEncrypter {

    Cipher ecipher;
    Cipher dcipher;

    DesEncrypter(SecretKey key) {
        try {
            ecipher = Cipher.getInstance("DES");
            dcipher = Cipher.getInstance("DES");
            ecipher.init(Cipher.ENCRYPT_MODE, key);
            dcipher.init(Cipher.DECRYPT_MODE, key);

        } catch (javax.crypto.NoSuchPaddingException e) {
            System.out.println();
        } catch (java.security.NoSuchAlgorithmException e) {
            System.out.println();
        } catch (java.security.InvalidKeyException e) {
            System.out.println();
        }
    }

    public String encrypt(String str) {
        try {
            // Encode the string into bytes using utf-8
            byte[] utf8 = str.getBytes("UTF8");

            // Encrypt
            byte[] enc = ecipher.doFinal(utf8);

            // Encode bytes to base64 to get a string
            return new sun.misc.BASE64Encoder().encode(enc);
        } catch (javax.crypto.BadPaddingException e) {
        } catch (IllegalBlockSizeException e) {
        } catch (UnsupportedEncodingException e) {
        } catch (java.io.IOException e) {
        }
        return null;
    }

    public String decrypt(String str) {
        try {
            // Decode base64 to get bytes
            byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);

            // Decrypt
            byte[] utf8 = dcipher.doFinal(dec);

            // Decode using utf-8
            return new String(utf8, "UTF8");
        } catch (javax.crypto.BadPaddingException e) {
        } catch (IllegalBlockSizeException e) {
        } catch (UnsupportedEncodingException e) {
        } catch (java.io.IOException e) {
        }
        return null;

    }

    protected static SecretKeySpec obtemSenha(String ent) {

        try {
            SecretKeySpec desKey;
            MessageDigest md = MessageDigest.getInstance("SHA");
            try {
                md.update(ent.getBytes("ISO-8859-1"));
                byte[] cipher = md.digest();

                if (cipher.length > 8) {
                    byte[] cipherF = new byte[8];
                    for (int i = 0; i < 8; i++) {
                        cipherF[i] = cipher[i];
                    }
                    desKey = new SecretKeySpec(cipherF, "DES");
                } else {
                    desKey = new SecretKeySpec(cipher, "DES");
                }

                return desKey;
            } catch (UnsupportedEncodingException ex) {
                Logger.getLogger(DesEncrypter.class.getName()).log(Level.SEVERE, null, ex);
                return null;
            }
        } catch (NoSuchAlgorithmException ex) {
            Logger.getLogger(DesEncrypter.class.getName()).log(Level.SEVERE, null, ex);
            return null;
        }

    }
}

